Paper-box machine



(No Model.)

H. MOTT. PAPER BOX MACHINE.

No. 593,026. Patented Nov., 2, 1897.

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UNITED STATES rParana* @erica HENRY MOTT, OF DETROIT, MICHIGAN.

PAPER-BOX MACHINE.

SPECIFICATION forming part of Letters Patent No. 593,026, dated November 2, 1897.

Application filed December 14, 1896. Serial No. 615,680. (No model.)

To @ZZ whom t `may concern.-

Be it known that I, HENRY MOTT, a citizen of the United States, residing at Detroit, in the county of "Wayne and State of Michigan,

have invented certain new and useful Inl-- provements in Paper-BOX Machines, of which the following is a specilication, reference being had therein to the accompanying drawings.

My invention relates to that class of paperbox machines in which the blanks are folded around a reciprocating plunger and then pressed thereby into the links of an endless mold-chain, which is intermittently fed to register said links successively with the plunger. NVith machines of this type difficulty has been experienced in forming boxes with permanently-rectangular bends between the sides and bottom. This is due to the fact `that there is sufcient elasticity to the material to cause it to partially spring back from the position into which it is bent. -To overcome this difculty acute-angle forming edges have been formed on the plunger by recessing it on its bottom, and the machine has been provided with an extra plunger which at a certain point in the operation is pressed up from a recess in the bed into the link of themold-chain and against the under side of the formingplunger, being withdrawn again into its recess before the movement of the chain. A machine thus constructed will form boxes that will remain perfectly rectangular, but the mechanism employed is objectionable, for if the lower plunger is not fully withdrawn into the bed before the mold-chain is moved laterally it will be caught in the link and serious damage done to the machine. This accident has frequently occurred in the running of machines of this character by reason of dirt lodging in the recess in which the lower plunger is reciproca-ted. Another objection to such a machine is that the additional plunger, together with its actuating mechanism, greatly increases the complication of the mechanism.

It is the object of my improvement to provide a simple contrivance for forming the rectangular corners on the boxes and one which is entirely free from all danger of catching on the chain; and to this end my invention consists in the peculiar construction and arrangement of a box-machine provided with a grooved bed having a central panel the face of which is always on or below the surface of the bed, in combination with a recessed forming-plunger and buifer-springs, all as more fully hereinafter described and claimed.

In the drawings, Figure lis a sectional perspectiveview of the forming-plun ger and one of the mold-links of my machine, showing a box partly pressed into the mold. Fig. 2 is a vertical section at right angles to Fig. l with the plunger in its lowest position. Fig. 3 is a vertical section showing a modiiication.

A is the bed ofthe machine.

B is one of the links of an intermittentlyfed mold-chain, and C is a reciprocating forming-plunger. As this type of machine is well known in the art I have thought it unnecessary to show the mechanism for reciprocating the plunger, for intermittently-feeding the mold-chain, and for feeding the paper blanks into position to be formed, or any of the other parts belonging to the box-forming mechanism.

The plunger C is provided on each side with the plates D, which project below the lower edge of the plunger and are beveled on the inside to form acute-angle edges. Below these plates is formed a groove E in the bedplate, having the outer perpendicular face a and the inner inclined face b of substantially the bevel of the plates.

In the-construction shown in Figs. l and 2 the central panel A", included within the groove E, is formed on an integral part of the bed. vYVith this construction the plunger C is formed in two parts, the upper part or shank C fitting in a recess in the lower part and containing in recesses c the buffersprings F.

G is a securing-pin passing through the two parts of the plunger, having a slotted bearing G in the part G', which admits of a slight longitudinal sliding movement on the pin.

H is a screw in the part C', forming an adj ustable stop limiting the movement of the pin.

In the modification shown in Fig. 3 of the IOO drawings a solid plunger is used, and theA In the operation of the machine lthe sides and ends of the boX are iirst turned up around the, end of the plunger, and the latter is then forced down into the mold, the plates D entering the groove E. This will bend the corners sharply around the acute-angle edge of the plates, the buffer spring allowing the plunger to press the paper into firm contact with the panel A of the bed Without danger of cutting the paper. Thus a rectangular box is formed, and as the plunger is always Withdrawn from the mold by positive mechanism before the mold-chain is fed laterally there can be no danger of its catching on the li'nk.

What I claiin as my invention isel. In a paper-box machine, the combination of a series of laterally-movable molds, a bed belouT said molds provided with a groove adapted to register With the movable molds, and a plunger having acute-angle forming edges adapted to pass through the molds and enter the groove in the bed.

2. In a paper-box machine, the combination of a bed, a panel movable in a recess I therein and forming With the Walls of said recess a groove in the surface of the bed,

means adapted to prevent the panel projecting beyond the surfaceof the bed, a plunger having acutewangle forming edges adapted to be forced into said groove, and a series of molds movable between the plunger and the bed, and through which the plunger passes.

3. In a box-machine, the combination of a bed having a groove vformed therein, a plunger comprising a head With acute-angle forming edges adapted to enter the groove in the bed, a shank having a limited sliding engagement With the head, and buffer-springs between the head and shank, and a mold-chain movable between the bed and the plunger.

4. Aplunger comprising a head, a shank With which said head has a 'sliding engagement provided with longitudinal recesses and a transverse slot, springs seated in saidv re HENRY MOTT.

Witnesses: g l

J AMES WnirrnMoRn, OTTO F. BARTHEL. 

